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Most battery’s are rated to be dead at 12v and have testing of around 12.9 so at 12.3 that’s almost dead lol, if those resting voltage are after charging them I’d say both battery’s are bad or going bad.

Not sure if dif brands have dif resting voltages so it could be different.

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Select battery type (agm) place in charge mode, when charge is complete it will automatically go into maintain mode (pulsing green LED). *If the charger
has to provide its maximum maintain
current for a continuous 12 hour period,
it will go into abort mode (see Aborted
Charge section)*

Leave it in maintain for a day, then remove charger for a day, then check battery resting voltage with a multimeter

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Select battery type (agm) place in charge mode, when charge is complete it will automatically go into maintain mode (pulsing green LED). *If the charger
has to provide its maximum maintain
current for a continuous 12 hour period,
it will go into abort mode (see Aborted
Charge section)*

Leave it in maintain for a day, then remove charger for a day, then check battery resting voltage with a multimeter

Also the schumacher cant go to desulphate directly. Should I get a ctek charger? Those can directly choose desulphate.